Stocks that moved substantially or traded heavily on Wednesday:
AutoNation Inc., up 82 cents to $43.91
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CEO Mike Jackson is departing after almost two decades leading the nation's largest auto dealership chain.
Fitbit Inc., up 31 cents to $6.11
The maker of wearable exercise trackers launched a platform that offers personalized coaching.
MGM Resorts International, up 78 cents to $28.37
The New York Post reported that activist investor Starboard Value has taken a big stake in the casino operator.
Praxair Inc., up $6.20 to $164.37
News outlets reported the industrial gases company is moving closer to U.S. antitrust approval of its merger with Germany's Linde.
Copart Inc., down $8.59 to $55.58
The operator of online vehicle auctions reported earnings that fell short of analysts' estimates.
Danske Bank A/S, down 55 cents to $12.92
The CEO of Denmark's largest bank resigned after an internal report found many suspicious accounts in an Estonian subsidiary.
Microsoft Corp., down $1.51 to $111.70
Technology companies lagged the market on Wednesday.
Halliburton Co., up 90 cents to $40.06
Energy companies rose along with the price of crude oil.